METHOD AND DEVICE FOR LINK AGGREGATION

The disclosure discloses a method and a device for link aggregation. The method includes: turning off data frame transmitting-receiving functions of all ports; when a timer of a Transmit machine expires, a Selection Logic machine selects a TRUNK for a port, a timer of a Mux machine is set and started, and the Mux machine prepares to add the port to the selected TRUNK; and when the timer of the Mux machine and the timer of the Transmit machine expire simultaneously, the Mux machine adds the port to the selected TRUNK, turns on the data frame transmitting-receiving function of the port according to aggregation state information in a received LACPDU message, and performs application message transmission. The method and the device of the present disclosure ensure simultaneous turning-on of the data frame transmitting-receiving function by properly setting the timer duration of each state machine, thereby reducing application message loss; in case an abnormality occurs at an aggregated link, the data frame transmitting-receiving function is turned off timely, increasing reliability of application message transmission by the aggregated link.